From Austria, a performance boost with a German accent. The technicians at Remus have developed a free-flow exhaust system that reduces backpressure between 35% and 85%. Each Remus muffler has been engineered to suit specific BMW models. These adjustments are based on knowledge gained from actual racing experience. The result is a 3% to 5% horsepower gain that is not only measurable on the dynamometer but noticeable in real world driving as well. Remus engineers have also been successful at transforming the high sound frequencies generated by free-flow exhausts into a deep, throaty sound that is distinctly different from other BMWs on the road. (Some Remus owners tell us their BMWs sound like they're speaking with a German accent!) Mounts to factory attachment points on most models. Two year, unlimited mileage warranty. Some models for off-road use only.